US8132301B2 - Worm thread clamp - Google Patents

Worm thread clamp Download PDF

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Publication number
US8132301B2
US8132301B2 US12/327,252 US32725208A US8132301B2 US 8132301 B2 US8132301 B2 US 8132301B2 US 32725208 A US32725208 A US 32725208A US 8132301 B2 US8132301 B2 US 8132301B2
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US
United States
Prior art keywords
bridge
accordance
thread clamp
tension strap
worm thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US12/327,252
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English (en)
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US20090139064A1 (en
Inventor
Jason Walker
Mathias Krauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norma Germany GmbH
Original Assignee
Norma Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Norma Germany GmbH filed Critical Norma Germany GmbH
Assigned to NORMA GERMANY GMBH reassignment NORMA GERMANY GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRAUSS, MATHIAS, WALKER, JASON
Publication of US20090139064A1 publication Critical patent/US20090139064A1/en
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Publication of US8132301B2 publication Critical patent/US8132301B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/02—Hose-clips
    • F16L33/08—Hose-clips in which a worm coacts with a part of the hose-encircling member that is toothed like a worm-wheel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/10—Miscellaneous
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1412—Bale and package ties, hose clamps with tighteners
    • Y10T24/1427—Worm and tooth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1412—Bale and package ties, hose clamps with tighteners
    • Y10T24/1433—Integral thread
    • Y10T24/1435—External thread
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1412—Bale and package ties, hose clamps with tighteners
    • Y10T24/1441—Tangential screw

Definitions

  • the invention relates to a worm thread clamp with a tension strap that has end sections overlapping one another in the circumferential direction, a housing connected to the radially inner end section and a tension screw arranged in the housing.
  • the screw is in engagement with thread elements on the radially outer end section, and the radially inner end section projects over the housing with a bridge in the circumferential direction.
  • a worm thread clamp of this type is known, for example, from German Patent No. DE 196 33 435 C1.
  • the housing of a worm thread clamp should terminate flush with the tension strap on the radial inner side of the tension strap so that a component, for example, a hose, to be attached with the aid of the worm thread clamp is loaded with pressure as uniformly as possible over the entire circumference.
  • the housing hereby often has a retaining rib that is arranged on the radial inner side of the radially inner end section.
  • the bridge that is, the part of the radially inner end section that at the end of the radially inner end section projects out of the housing or projects over the housing, serves as counter-bearing for the clamping head that has the housing and the tension screw.
  • the bridge ends at a certain distance from the housing so that a shoulder on the inside of the tension strap is as soft as possible so as to avoid damage to a hose as much as possible.
  • This arrangement can have a negative impact with respect to the tightness of a connection secured with the hose clamp between a hose and a support, particularly with a smaller nominal diameter. In an extreme case, the bridge could even prevent the molding of the clamp strap onto the hose.
  • the worm thread clamp can jam before it has reached the diameter necessary for clamping, which results in a failure of the connection system. This failure can also lead to an increased risk of injury to the operator, since the torque rises during clamping of the worm thread clamp, but the worm thread clamp is not prevented from rotation by the hose. The complete momentum must be absorbed by the operator holding the worm thread clamp.
  • a worm thread clamp is provided with good processability at low expenditure.
  • a worm thread clamp of the type mentioned at the outset includes a bridge having an enclosed weakening area.
  • the bending stiffness of the bridge is reduced through the weakening area.
  • the weakening area does not extend through to an edge of the bridge at any point, so that the outer contour of the bridge remains unchanged compared to a bridge without a weakening area. It is thus possible to ensure, for example, that no interfering edges or the like are present that could have a negative impact on the production or the handling of the worm thread clamp.
  • the idle torque is kept at a very low and above all constant level up to the smallest diameter of the worm thread clamp, which has a positive impact on the clamping force of the worm thread clamp.
  • the torque dispersion is also reduced to a minimum. The ease of assembly of the clamp is increased and the risk of injury to an operator is reduced.
  • the weakening area is embodied or formed as a cross-sectional reduction.
  • the bridge therefore has less material in the weakening area, which could oppose resistance to a deformation.
  • the weakening area is embodied or formed as an opening.
  • Material of the bridge is therefore lacking in the opening, so that this material no longer opposes any resistance to the deformation of the bridge.
  • the opening is completely enclosed in the circumferential direction, and thus not open to the end of the clamp strap so that the bridge provided with the opening can in principle be handled just like a conventional bridge with a worm thread clamp.
  • the weakening area is limited by a boundary that runs parallel to the outer contour of the bridge.
  • the bridge thus has on its circumferential edge a web with an approximately constant thickness.
  • parallel should not be understood here in the mathematically exact sense. Minor deviations from parallelism are easily permissible.
  • the weakening area in principle has a scaled down shape of the shape of the bridge. The deformation behavior of the bridge can thus be easily controlled.
  • the bridge has lateral flanks at least one of which is chamfered relative to the circumferential direction.
  • the bending stiffness can also be reduced thereby.
  • the bridge becomes ever narrower towards its free end, thus the end facing away from the housing, so that the bending stiffness decreases towards the free end.
  • such a small deformation resistance can be realized here that the idle torque can be kept essentially the same over the complete tightening of the tension screw.
  • the bridge has a point that from the interior bears against an axial edge area of the radially outer end section.
  • an axial edge area of the radially outer end section Through the insertion of the thread element into the radially outer end section, under favorable circumstances deformations can also result on the radial inner side of the radially outer end section, which impedes a displacement of the free end of the bridge with respect to the radially outer end section.
  • the thread elements are located in the axial center of the tension strap. An axial edge area remains free of thread elements. If the point of the bridge now bears against this free and thus smooth edge area, the thread elements cannot impede the advancement of the free end of the bridge and thus the tightening of the worm thread clamp.
  • the point is arranged on the axial edge area, on which the radially outer end section has an insertion projection.
  • the point of the bridge can thus be additionally used to thread the radially outer end section of the tension strap into the clamping head.
  • the insertion projection is guided through the point of the bridge and subsequently the bridge itself.
  • the bridge is provided with transverse grooves at least on its radial inner side.
  • the transverse grooves also reduce the bending stiffness of the bridge. Since in particular with the embodiment of the weakening area as an opening, less material is deformed in order to produce the transverse grooves, the tool wear is lower.
  • the transverse grooves leave free at least part of the weakening area.
  • the weakening area is embodied or formed in a triangular shape. In this case, the reduction in bending stiffness through the weakening area is sufficient so that no additional transverse grooves are necessary.
  • embodiments of the invention are directed to a worm thread clamp that includes a tension strap having end sections arranged to overlap in a circumferential direction to form a radially inner end section and a radially outer end section, a housing connected to the radially inner end section, and a tension screw arranged in the housing to engage thread elements on the radially outer end section.
  • the radially inner end section is arranged to project from the housing in the circumferential direction and includes a bridge, and a weakening area is enclosed in the bridge.
  • the weakening area can include a cross-sectional reduction.
  • the weakening area may include an opening.
  • the weakening area may be limited by a boundary arranged essentially parallel to edges of the bridge.
  • the bridge can include lateral flanks, at least one of which is chamfered relative to the circumferential direction.
  • the bridge can include a point arranged to bear against an axial edge area of the radially outer end section.
  • the radially outer end section may include an insertion projection adjacent the axial edge area, and the point is arranged on the axial edge area.
  • the bridge may include transverse grooves arranged at least on a radially inner surface.
  • the transverse grooves can leave at least part of the weakening area free.
  • Embodiments of the invention are directed to a method of forming a worm thread clamp.
  • the method includes forming a bridge at an end of a tension strap, forming a weakening area within the bridge, coupling a housing to the tension strap so the bridge projects from the housing, and arranging an end of the tension strap opposite the bridge to overlap the bridge. In this manner, at least a portion of the bridge slides on a surface of the tension strap.
  • the bridge can include at least one chamfered surface relative to a length direction of the tension strap.
  • the at least one chamfered surface may form a point at an end of the bridge, and the point can form the at least a portion of the bridge that slides on the surface of the tension strap.
  • the method can further include forming threads on a surface of the tension strap opposite the surface on which the at least a portion of the bridge slides.
  • the at least a portion of the bridge that slides of the surface of the tension strap can be located in an area axially outside the threads.
  • the method may also include forming lateral grooves in a portion of the bridge.
  • the lateral grooves can extend through the weakening area.
  • Embodiments of the invention are directed to a worm thread clamp that includes a tension strap having first and second ends that are overlappable in a circumferential direction to form an inner end and an outer end, a housing connected to the inner end, and the inner end including a bridge having an enclosed weakening area.
  • the tension strap can include threads formed on a surface.
  • the bridge may include at least one chamfered edge relative to a length direction of the tension strap forming a point structured and arranged to slide on a surface of the tension strap opposite the threads. The point can be arranged to contact the surface of the tension strap opposite the threads in a region axially outside of the threads.
  • FIG. 1 illustrates a perspective view of a worm thread clamp according to embodiments of the invention
  • FIG. 2 illustrates in greater detail section II depicted in FIG. 1 ;
  • FIG. 3 illustrates an unwound worm thread clamp according to embodiments of the invention.
  • a worm thread clamp 1 has a tension strap 2 with two end sections 3 and 4 .
  • the two end sections 3 and 4 are arranged to overlap so that a radially outer end section 3 and a radially inner end section 4 result.
  • Tension strap 2 is curved in an approximately circular manner, so that in principle a cylinder is formed. The following directional data, axial, radial and circumferential direction, therefore relate to the referenced cylinder.
  • a clamping head 5 has a housing 6 connected to radially inner end section 4 , and a tension screw 7 .
  • Tension screw 7 is held in housing 6 in a permanent manner and is in engagement with thread elements 8 on the circumferential surface of tension strap 2 .
  • radially outer end section 3 is guided between radially inner end section 4 and tension screw 7 .
  • tension screw 7 By rotation of tension screw 7 , radially outer end section 3 is moved so that the interior diameter of tension strap 2 of worm thread clamp 1 is changed.
  • radially inner end section 4 forms a shape 9 with an approximately U-shaped cross section in which a web 10 of housing 6 is arranged such that the radial inner side of web 10 is installed approximately flush with the radial inside of radially inner end section 4 .
  • Radially inner end section 4 projects towards its free end 11 beyond web 10 and thus forms a so-called bridge 12 .
  • Form 9 serves as counter-bearing to hold clamping head 5 .
  • Bridge 12 bears against radial inside 13 of radially outer end section 3 during tightening. A doubling of the material of tension strap 2 results where bridge 12 is located.
  • bridge 12 has a weakening area 14 in the form of an opening enclosed on all sides.
  • the outer contour of bridge 12 is thus generally unchanged as compared to a bridge without weakening area 14 .
  • the handling of the worm thread clamp 1 according to the invention is substantially similar to the handling with hitherto known worm thread clamps with different bridge embodiments.
  • bridge 12 has a relatively small idle torque that can be kept at a constant level up to the smallest diameter of worm thread clamp 1 . This has a positive impact on the clamping force of worm thread clamp 1 .
  • the dispersion of the idle torque is also reduced to a minimum. The processability of worm thread clamp 1 is thereby improved, because less force is necessary to tighten the worm thread clamp until generation of the actual clamping force.
  • Weakening area 14 is limited by a boundary 15 that runs approximately parallel to an outer contour of bridge 12 , i.e., weakening area 14 is a scaled down image of bridge 12 .
  • bridge 12 is embodied or formed in an approximately triangular manner.
  • Free end 11 forms a point or apex, although the point may be rounded as shown in the exemplary illustration.
  • weakening area 14 is also embodied or formed in an approximately triangular manner.
  • bridge 12 has two lateral flanks 16 and 17 that formed at an angle with respect to the circumferential direction of tension strap 2 , such that the sides of bridge 12 are chamfered.
  • FIG. 3 shows a modified embodiment in which identical elements corresponding to one another are provided with the same reference numbers.
  • Worm thread clamp 1 is shown in a state in which radially outer end section 3 has been pulled out of housing 6 , i.e., tension strap 2 is unwound and lying flat.
  • bridge 12 only includes a single chamfered lateral flank 16 forming a point 18 that bears against radially outer end section 3 from the inside in an area axially outside of thread elements 8 . Because point 18 is arranged to bear against radially outer end section 3 in a region axially outside of thread elements 8 , projections resulting on the inner side of radially outer end section 3 , e.g., due to stamping of thread elements 8 , do not hinder the smooth movement of bridge 12 over the radially outer end section 3 .
  • radially outer end section 3 has a threading projection 19 that is arranged on the same axial edge as point 18 .
  • threading projection 19 is guided over the greatest possible length onto bridge 12 .
  • Bridge 12 can be provided with transverse grooves 20 on its radial inner side.
  • Transverse grooves 20 can be limited, however, to an area where bridge 12 has not reached its full width.
  • Transverse grooves 20 can cover weakening area 14 only in part, or can leave weakening area 14 completely free. Since here only a little material needs to be deformed, the tool wear is limited in the production of transverse grooves 20 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
US12/327,252 2007-12-04 2008-12-03 Worm thread clamp Active 2030-07-04 US8132301B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007058319.4-24 2007-12-04
DE102007058319A DE102007058319B4 (de) 2007-12-04 2007-12-04 Schneckengewindeschelle
DE102007058319 2007-12-04

Publications (2)

Publication Number Publication Date
US20090139064A1 US20090139064A1 (en) 2009-06-04
US8132301B2 true US8132301B2 (en) 2012-03-13

Family

ID=40474636

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/327,252 Active 2030-07-04 US8132301B2 (en) 2007-12-04 2008-12-03 Worm thread clamp

Country Status (10)

Country Link
US (1) US8132301B2 (de)
EP (1) EP2068064B1 (de)
JP (1) JP5040896B2 (de)
CN (1) CN101493167B (de)
DE (1) DE102007058319B4 (de)
ES (1) ES2717008T3 (de)
HU (1) HUE043147T2 (de)
PL (1) PL2068064T3 (de)
RU (1) RU2387913C1 (de)
TR (1) TR201903540T4 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100212117A1 (en) * 2009-02-25 2010-08-26 Haase Edward A Compostable Tie
WO2014133471A1 (en) 2013-02-27 2014-09-04 Kale Baglanti Teknolojileri Sanayi Ve Ticaret Anonim Sirketi̇i Positionable worm drive hose clamp mounted on hoses
ES2415249B2 (es) * 2013-03-27 2013-11-26 Grupo Mikalor, S.L. Abrazadera
DE102016102197B3 (de) * 2016-02-09 2017-08-03 Norma Germany Gmbh Schlauchschelle
CN107259843A (zh) * 2017-08-01 2017-10-20 赵本博 桌沿夹固装置

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR532057A (fr) 1921-02-25 1922-01-27 Perfectionnements dans les colliers de serrage ou d'assemblage
US2571659A (en) * 1942-05-22 1951-10-16 Bergstrom Knut Edwin Clamp
US3351989A (en) * 1966-12-05 1967-11-14 Sterling Automotive Mfg Co Inc Hose clamp
US4099304A (en) * 1975-06-04 1978-07-11 Tridon-Serflex S.A. Screw type clamping collar
US4813109A (en) * 1986-08-20 1989-03-21 Illinois Tool Works Inc. Clip for fastening the ends of an elongate flexible band
US5560087A (en) * 1993-07-21 1996-10-01 Stant Corporation Laterally secure hose-clamp assembly
US5706558A (en) * 1995-10-19 1998-01-13 Rasmussen Gmbh Hose clamp
DE19633435C1 (de) 1996-08-20 1998-02-12 Rasmussen Gmbh Schneckengewindeschelle
US5809619A (en) * 1997-03-05 1998-09-22 Stant Corporation Hose clamp
US6000104A (en) * 1998-02-16 1999-12-14 Rasmussern Gmbh Clip
FR2781865A1 (fr) 1998-07-29 2000-02-04 Serflex Collier de serrage a vis tangente
US6449813B2 (en) * 2000-05-25 2002-09-17 Rasmussen Gmbh Worm-driven hose clamp
US6845549B2 (en) * 2002-04-03 2005-01-25 Rasmussen Gmbh Worm drive hose clip
US7467442B2 (en) * 2007-04-06 2008-12-23 Dian-Tai Chen Hose clamp
US7765650B2 (en) * 2007-05-21 2010-08-03 Epicor Industries, Inc. Two-piece hose clamp and variable length clamp kit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52131575U (de) * 1976-04-01 1977-10-06
DE10214663A1 (de) * 2002-04-03 2003-10-23 Rasmussen Gmbh Schneckengewindeschelle
JP2007192387A (ja) * 2006-01-23 2007-08-02 Kato Seisakusho:Kk ホースバンド

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR532057A (fr) 1921-02-25 1922-01-27 Perfectionnements dans les colliers de serrage ou d'assemblage
US2571659A (en) * 1942-05-22 1951-10-16 Bergstrom Knut Edwin Clamp
US3351989A (en) * 1966-12-05 1967-11-14 Sterling Automotive Mfg Co Inc Hose clamp
US4099304A (en) * 1975-06-04 1978-07-11 Tridon-Serflex S.A. Screw type clamping collar
US4813109A (en) * 1986-08-20 1989-03-21 Illinois Tool Works Inc. Clip for fastening the ends of an elongate flexible band
US5560087A (en) * 1993-07-21 1996-10-01 Stant Corporation Laterally secure hose-clamp assembly
US5706558A (en) * 1995-10-19 1998-01-13 Rasmussen Gmbh Hose clamp
DE19633435C1 (de) 1996-08-20 1998-02-12 Rasmussen Gmbh Schneckengewindeschelle
US5809619A (en) * 1997-03-05 1998-09-22 Stant Corporation Hose clamp
US6000104A (en) * 1998-02-16 1999-12-14 Rasmussern Gmbh Clip
FR2781865A1 (fr) 1998-07-29 2000-02-04 Serflex Collier de serrage a vis tangente
US6449813B2 (en) * 2000-05-25 2002-09-17 Rasmussen Gmbh Worm-driven hose clamp
US6845549B2 (en) * 2002-04-03 2005-01-25 Rasmussen Gmbh Worm drive hose clip
US7467442B2 (en) * 2007-04-06 2008-12-23 Dian-Tai Chen Hose clamp
US7765650B2 (en) * 2007-05-21 2010-08-03 Epicor Industries, Inc. Two-piece hose clamp and variable length clamp kit

Also Published As

Publication number Publication date
JP2009138934A (ja) 2009-06-25
PL2068064T3 (pl) 2019-06-28
US20090139064A1 (en) 2009-06-04
DE102007058319B4 (de) 2013-06-27
JP5040896B2 (ja) 2012-10-03
TR201903540T4 (tr) 2019-04-22
EP2068064B1 (de) 2018-12-19
EP2068064A3 (de) 2016-12-28
CN101493167A (zh) 2009-07-29
CN101493167B (zh) 2012-08-01
EP2068064A2 (de) 2009-06-10
HUE043147T2 (hu) 2019-07-29
RU2387913C1 (ru) 2010-04-27
ES2717008T3 (es) 2019-06-18
DE102007058319A1 (de) 2009-06-18

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